It's been in production for a long time. Shame it is download only.
As for being "clones of clones" they are all 3D Isometric / above view games so of course they are going to look similar given the same technology for each. Same could be said about all FPS games.
I am sure the gameplay will be quite different between the games.
I dont think any will have gameplay that is revolutionary. Unfortunately revolutionary gameplay costs money and usually doesn't sell.